Targetting a general audience?

Hello,

I have tested a few products on my store, and I got lucky to get one sale once. After that I haven't had any success.

My question is, do you guys have any tips on how to try and find interests to target for a general product? I always try to link a product to some niche or hobby so I can target it that way.. but with some products I just can't find anything like that.. So I would appreciate it if someone can share some tips on how to find interests for more general products?

Thank you